65998919414736 has 800 divisors, whose sum is σ = 241200240196608. Its totient is φ = 16923671470080.

The previous prime is 65998919414717. The next prime is 65998919414741. The reversal of 65998919414736 is 63741491989956.

65998919414736 is a `hidden beast` number, since 6 + 5 + 9 + 98 + 9 + 19 + 41 + 473 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 18246865600 + ... + 18246869216.

Almost surely, 2^{65998919414736} is an apocalyptic number.

65998919414736 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65998919414736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120600120098304).

65998919414736 is an abundant number, since it is smaller than the sum of its proper divisors (175201320781872).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65998919414736 is a wasteful number, since it uses less digits than its factorization.

65998919414736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5941 (or 5926 counting only the distinct ones).

The product of its digits is 3174474240, while the sum is 81.

The spelling of 65998919414736 in words is "sixty-five trillion, nine hundred ninety-eight billion, nine hundred nineteen million, four hundred fourteen thousand, seven hundred thirty-six".